Journal
BIORESOURCE TECHNOLOGY
Volume 309, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2020.123316
Keywords
Coagulation; flocculation; Extracellular polymeric substances; Tetracycline; Mediated effect; Density functional theory
Funding
- Major Science and Technology Program for Water Pollution Control and Treatment [2018ZX07110004]
- National Natural Science Foundation of China [51678546, 41630318]
- Chinese Universities Scientific Fund of China University of Geosciences (Wuhan)
- Fundamental Research Funds for the Central Universities, China University of Geosciences (Wuhan) [CUGGC06]
- high-performance computing platform of China University of Geosciences
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In this study, the effect of extracellular polymer substances on the tetracycline removal under hydroxyl aluminium treatment was investigated, and the molecular mechanisms of extracellular polymeric substances mediated coagulation of tetracycline were also explored. The results show that the presence of extracellular polymeric substances could significantly enhance the removal efficiency of tetracycline in hydroxyl aluminium coagulation. Findings suggest that tyrosine and tryptophan in extracellular proteins acted as binding sites to capture tetracycline. Evidences provided by the density functional theory calculations in combination with spectroscopy analysis indicated that two main mechanisms accounted for tetracycline removal in the presence of extracellular polymeric substances and polyaluminum chloride: (1) amino group in proteins and carbonyl in tetracycline were bridged by Al3+; (2) benzene rings in tryptophan and tyrosine were pi-pi stacked with tetracycline, and the amino group in complexes were further coordinated with Al3+.
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